<h1>Biometric Aadhaar authentication required for GST registration: applicants may need to book a GSK appointment for verification.</h1> Rule 8 amendment allows applicant identification on the common portal using data analysis and risk parameters enabling Biometric-based Aadhaar Authentication with photograph capture and original-document verification. Post-submission of Form GST REG-01, applicants receive either an OTP-based Aadhaar link or an appointment-booking link for a designated GST Suvidha Kendra; if an appointment is required, the applicant must book a slot and present appointment confirmation, jurisdiction details, Aadhaar and PAN originals, and originally uploaded documents. ARNs issue after completion of biometric authentication and document verification.